Yes, our Enterprise edition can take advantage of SMP server by lshttpd itself.
Enterprise edition actually is licensed by number of worker processes, not by number of cpu sockets. So LSWS with any number of CPU license can be used on your server, unused CPU will be available to PHP and DB Server.

According to our study, hyper-threading may or may not help with performance at all, you may want to do some performance test with your web application.